I installed the Async CTP w/o knowing it would cause problems with Asp.NET MVC 3. So I\'ve followed every possible uninstall instruction out there re-installed both SP1 and
If you are using Visual Studio 2010 SP1 then the solution might be here: http://tedgustaf.com/en/blog/2011/4/installing-asp-net-mvc3-on-visual-studio-2010-sp1/
Try this:
Clear out the template cache located at "[ProgramFile x86]\Microsoft Visual Studio 10.0\Common7\IDE\ProjectTemplatesCache"
and then run devenv.exe /installvstemplates from the visual studio command line.